Add deprecation notice

Change-Id: I5483cc97f0dc43741d9a316de733152495000f94

README.md

diff --git a/README.md b/README.md
index 99b9edb..6e5aa48 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# events-gcloud-pubsub
+# DEPRECATION NOTICE
+
+GerritForge has decided to [change the license to BSL](https://gitenterprise.me/2025/09/30/re-licensing-gerritforge-plugins-welcome-to-gerrit-enterprise/)
+therefore the Apache 2.0 version of this plugin is deprecated.
+The recommended version of the events-gcloud-pubsub plugin is on [GitHub](https://github.com/GerritForge/events-gcloud-pubsub)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/events-gcloud-pubsub,general).
+
+# events-gcloud-pubsub (DEPRECATED)
 Gerrit event producer and consumer for [GCloud PubSub](https://cloud.google.com/pubsub/)
 
 ## Build